/**
 * ===========================================
 * Project: cyou-framework
 * ===========================================
 * Package: com.cyou.framework.baseutil
 * 
 * Copyright (c) 2012, CYOU All Rights Reserved.
 * ===========================================
 */
package com.cyou.framework.util;

import java.security.SecureRandom;
import java.util.UUID;

/**
 * <p>IdentityUtility</p>
 * <p>Description: 封装各种生成唯一性ID算法的工具类.</p>
 *
 * @since 1.0
 * @version 1.0 2012-11-30
 * @author zhangxingkai
 */
public class IdentityUtility {

	private static SecureRandom random = new SecureRandom();

	/**
	 * 封装JDK自带的UUID, 通过Random数字生成, 中间有-分割.
	 */
	public static String uuid() {
		return UUID.randomUUID().toString();
	}

	/**
	 * 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
	 */
	public static String uuid2() {
		return UUID.randomUUID().toString().replaceAll("-", "");
	}

	/**
	 * 使用SecureRandom随机生成Long. 
	 */
	public static long randomLong() {
		return Math.abs(random.nextLong());
	}

	/**
	 * 基于Base62编码的SecureRandom随机生成bytes.
	 */
	public static String randomBase62(int length) {
		byte[] randomBytes = new byte[length];
		random.nextBytes(randomBytes);
		return EncodeUtility.encodeBase62(randomBytes);
	}
	
}
